Reaction kettle for preparing battery-grade lithium carbonate

Abstract

The reaction kettle comprises a reaction kettle body, the top of the reaction kettle body is fixedly connected with a feeding pipe and a side pipe, the side pipe is located on the left side of the feeding pipe, the bottom of the feeding pipe is fixedly connected with a centrifugal pump, the top of the centrifugal pump is fixedly connected with the bottom of the reaction kettle body, and the top of the centrifugal pump is fixedly connected with the bottom of the reaction kettle body. The top of the reaction kettle body is fixedly connected with a drying box, the top of the drying box is fixedly connected with an upper gas pipe, and the bottom of the upper gas pipe is fixedly connected with a carbon dioxide supply mechanism. By arranging the drying box, the upper gas pipe, the carbon dioxide supply mechanism, the lower gas pipe, the permeable plate, the annular gas pipe and the spray head, carbon dioxide is injected upwards from the bottom in the reaction kettle body, can react with a mixed solution more uniformly after passing through the spray head and the permeable plate, is separated out after the mixed solution is heated, and can be continuously recovered and recycled; the carbon dioxide utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate production and processing, in particular to a reaction kettle for preparing battery-grade lithium carbonate. Background Art

[0002] With the rapid development of the new energy vehicle industry, my country has become the world's largest producer and seller of new energy vehicles. The production and sales of power batteries have also increased year by year. As one of the main raw materials for power batteries, the production of lithium carbonate has also been increasing.

[0003] At present, the industrial production method of battery-grade lithium carbonate mainly includes four steps: hydrogenation pretreatment, hydrogenation reaction, thermal decomposition, and mother liquor circulation. That is, carbon dioxide is added to lithium carbonate with higher precision to convert lithium carbonate into lithium bicarbonate, and then the lithium bicarbonate is heated to obtain high-purity lithium carbonate crystals. In the existing process, the utilization rate of carbon dioxide is low, and as the concentration of lithium bicarbonate decreases, the size of the crystals precipitated in the solution becomes larger and larger, resulting in different sizes of the final lithium carbonate crystal particles, which reduces the product quality. Utility Model Content

[0004] The utility model provides a reactor for preparing battery-grade lithium carbonate. Carbon dioxide is injected upward from the bottom of the reactor body. After passing through a nozzle and a breathable plate, the carbon dioxide can react with a mixed liquid more evenly. After the mixed liquid is heated, the carbon dioxide is precipitated and can be continuously recovered and recycled, thereby improving the utilization rate of the carbon dioxide. When the concentration of lithium bicarbonate in the internal mixed liquid decreases with increasing reaction time, the low-concentration mixed liquid is pumped upward by a centrifugal pump and ground into crystals with the same size as initially generated crystals by an upper grinding disc and a lower grinding disc in the process of precipitating lithium carbonate, thereby improving product quality.

[0005] To achieve the above-mentioned purpose, a reactor for preparing battery-grade lithium carbonate is provided, comprising: a reactor body, a feed pipe and a side pipe are fixedly connected to the top of the reactor body, the side pipe is located on the left side of the feed pipe, a centrifugal pump is fixedly connected to the bottom of the feed pipe, the top of the centrifugal pump is fixedly connected to the bottom of the reactor body, a drying box is fixedly connected to the top of the drying box, an upper air pipe is fixedly connected to the bottom of the upper air pipe, a carbon dioxide gas supply mechanism is fixedly connected to the bottom of the carbon dioxide gas supply mechanism, and a lower air pipe is fixedly connected to the inner circumferential surface of the reactor body. A heating plate is connected, an inner tank is fixedly connected to the inner circumferential surface of the heating plate, a main shaft is arranged inside the inner tank, a stirring blade is fixedly connected to the circumferential surface of the main shaft, an upper grinding disc is fixedly connected to the bottom of the main shaft, a lower grinding disc is arranged below the upper grinding disc, the lower grinding disc is fixedly connected to the inner tank, an air permeable plate is arranged below the lower grinding disc, an annular air pipe is arranged below the air permeable plate, a nozzle is fixedly connected to the circumferential surface of the annular air pipe, a plurality of nozzles are arranged and evenly distributed on the annular air pipe, and a temperature sensor is fixedly connected to the inner bottom surface of the reactor body.

[0006] According to the reactor for preparing battery-grade lithium carbonate, the bottom of the reactor body is fixedly connected to a pillar, a plurality of the pillars are provided and are evenly distributed at the bottom of the reactor body, the top of the reactor body is fixedly connected to a main motor, the main motor is located between a drying box and a feed pipe, and a discharge pipe is fixedly connected to the circumferential surface of the reactor body.

[0007] According to the reactor for preparing battery-grade lithium carbonate, the output end of the main motor passes through the reactor body and is fixedly connected to the top of the main shaft.

[0008] According to the reactor for preparing battery-grade lithium carbonate, the discharge pipe is located above the air permeable plate.

[0009] According to the reactor for preparing battery-grade lithium carbonate, the top input end of the centrifugal pump is connected to the reactor body.

[0010] According to the reactor for preparing battery-grade lithium carbonate, the bottom of the annular air pipe is fixedly connected to the inner bottom surface of the reactor body and is fixedly connected to the lower air pipe.

[0011] Beneficial effects of the utility model:

[0012] 1. By setting up a drying box, an upper air pipe, a carbon dioxide gas supply mechanism, a lower air pipe, a breathable plate, a circular air pipe and a nozzle, carbon dioxide is injected upward from the bottom of the reactor body. After passing through the nozzle and the breathable plate, it can react with the mixed liquid more evenly. After the mixed liquid is heated, the carbon dioxide is precipitated and can be further recovered and recycled, thereby improving the utilization rate of carbon dioxide;

[0013] 2. By setting up side pipes, centrifugal pumps, main shafts, stirring blades, upper grinding discs, lower grinding discs and main motors, when the concentration of lithium bicarbonate in the internal mixed liquid decreases with the increase of reaction time, the low-concentration mixed liquid is pumped upward by the centrifugal pump and ground by the upper and lower grinding discs into crystals of the same size as the initially generated crystals during the precipitation of lithium carbonate, thereby improving product quality.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 This is a front view of a reaction kettle for preparing battery-grade lithium carbonate according to the utility model;

[0017] Figure 2 This is a bottom view of a reaction kettle for preparing battery-grade lithium carbonate according to the utility model;

[0018] Figure 3 This is the internal structure diagram of the reaction kettle used for preparing battery-grade lithium carbonate in the utility model;

[0019] Figure 4 The utility model is a cross-sectional view of a reaction kettle for preparing battery-grade lithium carbonate.

[0020] Legend:

[0021] 1. Reactor body; 2. Feed pipe; 3. Side pipe; 4. Centrifugal pump; 5. Drying box; 6. Upper air pipe; 7. Carbon dioxide supply mechanism; 8. Lower air pipe; 9. Heating plate; 10. Inner tank; 11. Main shaft; 12. Stirring blade; 13. Upper grinding disc; 14. Lower grinding disc; 15. Breathable plate; 16. Annular air pipe; 17. Nozzle; 18. Temperature sensor; 19. Support; 20. Main motor; 21. Discharge pipe. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figure 1-4 The embodiment of the utility model is a reactor for preparing battery-grade lithium carbonate, which comprises: a reactor body 1, a feed pipe 2 and a side pipe 3 are fixedly connected to the top of the reactor body 1, a valve is provided on the feed pipe 2, the side pipe 3 is located on the left side of the feed pipe 2, a centrifugal pump 4 is fixedly connected to the bottom of the feed pipe 2, the top input end of the centrifugal pump 4 is connected to the reactor body 1, the top of the centrifugal pump 4 is fixedly connected to the bottom of the reactor body 1, and the mixed liquid at the bottom of the reactor body 1 is pumped upwards, and a drying box 5 is fixedly connected to the top of the reactor body 1 , used for drying carbon dioxide gas, the top of the drying box 5 is fixedly connected with an upper air pipe 6, the bottom of the upper air pipe 6 is fixedly connected with a carbon dioxide gas supply mechanism 7, the bottom of the carbon dioxide gas supply mechanism 7 is fixedly connected with a lower air pipe 8, the inner circumferential surface of the reactor body 1 is fixedly connected with a heating plate 9, which is used to heat the interior, accelerate the thermal decomposition of lithium bicarbonate into lithium carbonate and form crystals, the inner circumferential surface of the heating plate 9 is fixedly connected with an inner liner 10, the inner liner 10 is provided with a main shaft 11, and the circumferential surface of the main shaft 11 is fixedly connected with The stirring blade 12 is used to stir the internal mixed liquid to fully mix the lithium bicarbonate and the carbon dioxide. The bottom of the main shaft 11 is fixedly connected with an upper grinding disc 13, and a lower grinding disc 14 is arranged below the upper grinding disc 13. The lithium carbonate crystals between the upper grinding disc 13 and the lower grinding disc 14 are ground to change the size of the crystals. The lower grinding disc 14 is fixedly connected to the inner tank 10. A breathable plate 15 is arranged below the lower grinding disc 14 to block the passage of the crystals and allow the solution and carbon dioxide gas to pass through, and the carbon dioxide gas to pass through evenly. An annular air pipe 16 is arranged below the breathable plate 15. A nozzle 17 is fixedly connected to the circumferential surface of the annular air pipe 16. The number of nozzles 17 is set in multiples and is evenly distributed on the annular air pipe 16, so that the ejected carbon dioxide gas is more evenly distributed. The bottom of the annular air pipe 16 is fixedly connected to the inner bottom surface of the reactor body 1, and is fixedly connected to the lower air pipe 8. The inner bottom surface of the reactor body 1 is fixedly connected with a temperature sensor 18, which is used to monitor the temperature of the internal mixed liquid so that when crystals are precipitated, the crystallization conditions can be at an optimal temperature.

[0024] A support 19 is fixedly connected to the bottom of the reactor body 1. There are multiple support pillars 19 that are evenly distributed at the bottom of the reactor body 1. A main motor 20 is fixedly connected to the top of the reactor body 1. The main motor 20 is located between the drying box 5 and the feed pipe 2. The output end of the main motor 20 passes through the reactor body 1 and is fixedly connected to the top of the main shaft 11. A discharge pipe 21 is fixedly connected to the circumferential surface of the reactor body 1. A valve is provided on the discharge pipe 21, and the discharge pipe 21 is located above the air permeable plate 15.

[0025] Working principle: add mother liquor and high purity lithium carbonate from the feed pipe 2, close the feed pipe 2, start the carbon dioxide supply mechanism 7, inject carbon dioxide into the internal mixed liquid through the annular air pipe 16 and the nozzle 17, so that the lithium carbonate becomes lithium bicarbonate and dissolves in the liquid, start the main motor 20, stir the internal solution fully, and then start the heating plate 9 to heat the internal solution. At this time, the lithium bicarbonate is pyrolyzed and lithium carbonate crystals are formed. At the same time, start the centrifugal pump 4 to accelerate the flow between the upper and lower liquids. After a period of time, the concentration of lithium bicarbonate in the solution decreases. Under the action of the heart pump 4, the low-concentration lithium bicarbonate is located above the upper grinding disc 13 and flows downward from the edge of the upper grinding disc 13 to continue pyrolysis. Large-particle crystals condense between the upper grinding disc 13 and the lower grinding disc 14, making more low-concentration lithium bicarbonate solution on the upper grinding disc 13. The main motor 20 is started again to grind the large-particle crystals into fine crystals, which fall from the lower grinding disc 14 and are deposited on the breathable plate 15, thereby obtaining crystalline particles of uniform size. The carbon dioxide generated by pyrolysis passes through the drying box 5 and is recovered by the carbon dioxide supply mechanism 7 for convenient use next time.

[0026] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A reactor for preparing battery-grade lithium carbonate, comprising: A reaction kettle body (1), characterized in that a feed pipe (2) and a side pipe (3) are fixedly connected to the top of the reaction kettle body (1), the side pipe (3) is located on the left side of the feed pipe (2), a centrifugal pump (4) is fixedly connected to the bottom of the feed pipe (2), the top of the centrifugal pump (4) is fixedly connected to the bottom of the reaction kettle body (1), a drying box (5) is fixedly connected to the top of the drying box (5), an upper air pipe (6) is fixedly connected to the top of the upper air pipe (6), a carbon dioxide gas supply mechanism (7) is fixedly connected to the bottom of the carbon dioxide gas supply mechanism (7), a lower air pipe (8) is fixedly connected to the bottom of the carbon dioxide gas supply mechanism (7), a heating plate (9) is fixedly connected to the inner circumferential surface of the reaction kettle body (1), and a heating plate (9) is fixedly connected to the inner circumferential surface of the heating plate (9). An inner container (10) is connected, a main shaft (11) is arranged inside the inner container (10), a stirring blade (12) is fixedly connected to the circumferential surface of the main shaft (11), an upper grinding disc (13) is fixedly connected to the bottom of the main shaft (11), a lower grinding disc (14) is arranged below the upper grinding disc (13), the lower grinding disc (14) is fixedly connected to the inner container (10), a ventilation plate (15) is arranged below the lower grinding disc (14), an annular air pipe (16) is arranged below the ventilation plate (15), a nozzle (17) is fixedly connected to the circumferential surface of the annular air pipe (16), a plurality of nozzles (17) are arranged and are evenly distributed on the annular air pipe (16), and a temperature sensor (18) is fixedly connected to the inner bottom surface of the reaction kettle body (1).

2. The reactor for preparing battery-grade lithium carbonate according to claim 1, characterized in that: The bottom of the reactor body (1) is fixedly connected to a support (19), the support (19) is provided in a plurality and is evenly distributed at the bottom of the reactor body (1), the top of the reactor body (1) is fixedly connected to a main motor (20), the main motor (20) is located between the drying box (5) and the feed pipe (2), and a discharge pipe (21) is fixedly connected to the circumferential surface of the reactor body (1).

3. The reactor for preparing battery-grade lithium carbonate according to claim 2, characterized in that: The output end of the main motor (20) passes through the reaction kettle body (1) and is fixedly connected to the top of the main shaft (11).

4. The reactor for preparing battery-grade lithium carbonate according to claim 2, characterized in that: The discharge pipe (21) is located above the air permeable plate (15).

5. The reactor for preparing battery-grade lithium carbonate according to claim 1, characterized in that: The top input end of the centrifugal pump (4) is connected to the reaction kettle body (1).

6. The reactor for preparing battery-grade lithium carbonate according to claim 1, characterized in that: The bottom of the annular air pipe (16) is fixedly connected to the inner bottom surface of the reaction kettle body (1) and is also fixedly connected to the lower air pipe (8).

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